When octa core processor is coming into market,quad core phone seems to be not impressive.However,JIAKE G7 is the best quad core phone with some advanced technology such as Gesture Sensing Screen Smart Wake.The specs consists of Android 4.4 MTK6582 5.5 Inch screen,the price is at $79.99,it is really amazing.
You can buy it :http://vifocal.com/jiake-g7-smartphone-android-4-4-os-quad-core-5-5-inch-screen-3g.html


Basic Information
Model JIAKE G7
Band 2G: GSM 850/900/1800/1900MHz
3G: WCDMA 850/1900/2100MHz
Sim Card Dual SIM Card Dual Standby(one Micro SIM card)
Service Provide Unlocked
Style Bar
Color Black
Shell Material Plastic

System
OS Android 4.4.2
CPU MTK6582, Cortex A7 quad core, 1.3GHz;
GPU: Mali-400
ROM 4GB
RAM 512MB

Screen
Display Size 5.5 Inch
Type TFT, capacitive touch screen
Resolution 960 x 540 pixels QHD screen

Camera/Picture Resolution Dual Cameras, 2.0MP front camera, 8.0MP back camera with flashlight